一种天然存在的MTA1变体在细胞质中隔离雌激素受体α
Rakesh Kumar1, Rui-An Wang, Abhijit Mazumdar
1Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA. rkumar@mdanderson.org
Nature
|August 9, 2002
概括
一种新型的转移性瘤抗原1 (MTA1s) 的短形式将细胞质中的雌激素受体 (ER) 隔离,促进乳腺癌恶性病变. 这种MTA1s对ER的细胞质捕获阻碍了其核功能,并推动了癌症的进展.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 雌激素受体 (ER) 是乳腺癌治疗中的关键预后标志物.
- 转移性瘤抗原1 (MTA1) 的上调与各种癌症的侵入性和转移性潜力相关,作为ER-alpha联合抑制剂.
研究的目的:
- 确定和描述一种新的MTA1短型 (MTA1s),并阐明其在ER调节和乳腺癌进展中的作用.
- 研究MTA1s影响ER定位和功能的机制.
主要方法:
- 识别具有独特的33氨基酸序列的MTA1s,其中含有ER结合基因 (LRILL).
- 分析MTA1s局部化,ER相互作用,以及乳腺癌细胞中的功能后果.
- 对人类乳腺瘤中MTA1s表达的研究.
主要成果:
- MTA1s定位在细胞质上,与ER结合,并将其隔离,防止核转位并增强非基因组ER反应.
- 在MTA1s中删除LRILL图案取消了其ER相互作用和共同抑制功能,恢复了核ER定位.
- 人类表皮生长因子受体-2的失调增强了MTA1s表达和乳腺癌细胞中的ER细胞质封存.
- MTA1s表达与恶性表现型相关,在低核ER的人类乳腺瘤中增加.
结论:
- MTA1s作为细胞质ER结合蛋白,破坏ER信号传输并促进乳腺癌恶性病变.
- MTA1s和ER之间的相互作用代表了一种通过核排斥调节核受体信号传递的新机制.
- 针对MTA1s或其与ER的相互作用可能为乳腺癌提供新的治疗策略.
相关概念视频
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